381740380735781 has 4 divisors (see below), whose sum is σ = 381768875216652. Its totient is φ = 381711886254912.

The previous prime is 381740380735657. The next prime is 381740380735783. The reversal of 381740380735781 is 187537083047183.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 143396649327556 + 238343731408225 = 11974834^2 + 15438385^2 .

It is a cyclic number.

It is not a de Polignac number, because 381740380735781 - 2⁴² = 377342334224677 is a prime.

It is a super-2 number, since 2×381740380735781² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381740380735783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14247220340 + ... + 14247247133.

It is an arithmetic number, because the mean of its divisors is an integer number (95442218804163).

Almost surely, 2^{381740380735781} is an apocalyptic number.

It is an amenable number.

381740380735781 is a deficient number, since it is larger than the sum of its proper divisors (28494480871).

381740380735781 is a wasteful number, since it uses less digits than its factorization.

381740380735781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28494480870.

The product of its (nonzero) digits is 94832640, while the sum is 65.

The spelling of 381740380735781 in words is "three hundred eighty-one trillion, seven hundred forty billion, three hundred eighty million, seven hundred thirty-five thousand, seven hundred eighty-one".